Patent GB-477797-A (GB)
Abstract: 477,797. Calculating - machines. MATHYS, A. W. (Monroe Calculating Machine Co.) Nov. 16, 1936, No. 31264. [Class 106 (i)] The digits 0-4 are entered in a normal way into a calculating-machine but the setting of the setting means for any of the digits 5-9 adjusts the differential mechanism to add 1 in the next higher denomination and to subtract the complement of the set digit, the reversing mechanism for the differential actuators being controlled by the setting means. Items are set by sliding knobs 45, Figs. 1, 4, attached to racks 43 engaging pinions 42 mounted on forks 40 straddling pinions 35 slidable along square shafts 37. Each pinion 35 is thus brought adjacent teeth on a drum 33 shown developed in Fig. 2, the pinion cooperating with 0, 1, 2, 3, 4, 5, 4, 3, 2, 1 teeth as the knob 45 is moved from 0-9. The pinion 42 also engages a normally stationary rack 44. When the knob is moved from " 4 " to " 5 ", a projection on the rack 43 rocks clockwise a lever 46 having an arm 49 engaging a slot in the rack 44 of next higher denomination to set the pinion 35 of this rack to " 1." At the same time, the said higher rack 44 operates a reversing mechanism 52, 53 so that, when the machine is operated, the lower drum 33 is driven in reverse direction. Thus " 6 " is registered as " + 10-4." Subtraction. This is effected by reversing the direction of operation of the main shaft. Externally-operated transfer mechanism. When a numeral wheel passes through zero in either direction, a pin 65, Fig. 1, rocks a lever 66 to push to the right a slide 67 engaging a member 62 slidable along a square shaft 63 which is given one rotation at each machine actuation. The member 62 has a tooth which is thus brought opposite a pinion 64 on the actuating shaft 37 of next higher denomination to drive this shaft through one step. If a numeral wheel is rotated backwards to " 9 (during the registration of a digit " 5 ... 9 "), the lever 66 is rocked to set the slide 67 to cause a subtractive transfer in the higher denomination. Should the numeral wheel then advance to " 0 " by receiving an additive impulse by transfer from the lower denomination, it is necessary to neutralize the subtractive transfer prepared for the higher denomination. For this purpose each slide 67 carries a three-armed lever 68 the horizontal arm of which engages the lower end of the lever 66 after the first transfer (" 0-9 ") action. When the numeral wheel moves forward ("9-0") the lever 66 is again rocked and, through the lever 68, pushes the slide 67 a further step to the left so that the member 62 is moved to the left of the wheel 64 and no transfer is transmitted to the higher denomination. Self-contained transfer mechanism. This is shown in a modification, Figs. 5 and 7. The actuation is transmitted to a pinion 10 engaging a pinion 91 secured to a boss having an eccentric part on which is freely pivoted a floating gear 14 engaging internal teeth 15 on the numeral wheel 16. The floating gear 14 has internal teeth engaging a pinion 25 integral with a further pinion 23 which is moved through one step when the lower numeral wheel passes through zero, the pinion 23 being actuated by a roller 22 on a plate 21 connected by gearing to the lower numeral wheel 16. Specifications 27231/12, 24381/13, 19145/14, and 192,433, [all in Class 106 (i)], are referred to.